Francis armstrong



STATES. PATENT-mmf' FRANCIS AnMsrRoNe, or NewtonrlnaNs,` LOUISIANA.. i

CONSTRUCTIO OF GRATE-BARS FOR FURNACES.

Speccaton of Letters Patent No. 8,732, dated February 17, 1852;antedated August 17, 1851.`

To all whom 'it may concern:

` Be it known that I, FRANCIS ARMSTRONG., of the city of New Orleans, inthe State of `Louisiana, have invented a new and useful Improvement- ,inthe Construction of Grate- Bars of Furnaces, `which is described'asfollows, reference being had to the annexed `drawings of the same,making part of this specification. i

The nature of my invention and improvement consists in a peculiar formof the grate bars, they being different in their construction from thoseused in theordinary furnace in steam ships or vessels, having near their`forward ends inside of the fire fronts, jogs about half the width ofthe bars to secure them in their proper position without interferingwith the passage of the poker nto the openings in front and the spacesbetween them throughout their whole length, the

` fireman by their use being able to move the poker longitudinally overand upon said jogs during the operation of clearing out the so it beinga well settled principle in oombusw l the same.

obstructions" from the spaces between the bars. The advantages ofV thismode of constructing the bars being readily seen; for it is well knownthat in the absence of an adequate supply of the oxygen of the airtosupport combustion the fuel cannot be made to produce the heat it iscapable of giving out;

tion that in all cases the quantity of heat evolved "is proportional tothe quantity of `oxygen which enters into combination.

Description.

Figure l is a front,`or endelevation of two `furnaces and two boilers,constructed and arranged Iin the usual manner-except4 so far `as relatesto the grate bars and openings in the center thereof designed to strikeagainst corresponding jogs on the adjacent bars for keeping them at auniform distance apart and to form parallel spaces or channels ben tweenthe bars for the ready introduction of a long straight poker B forclearing out any accumulated ashes, or cinders, or coals, that maychance to lodge between the bars and clog and stop the spaces. The frontand rear end of' each grate bar are reduced in depth forming shoulders cwhich are to rest against` the horizontal bars D of the frame of thefurnace.

The outer ends of the bars are tapered for the purpose of increasing thedraft and for allowing a more ready introduction of the poker. The barswhen properly adjusted with the jogs on a line and in Contact becomestationary,vbut may be easily removed for any purpose desired by raisingthe rear ends and drawing the bars inward which is easily accomplished.The openings E in the front of the furnace must be of such size as to`permit the ends of the bars `to pass through freely and to form thespaces nec* essary for the free admission of theair and for theintroduction of the `poker when required to clear the grate of`injurious obstructions. The bars A cannot be withdrawn from theoutside'nor from the inside during the operation of the furnace-the firemust be completely extinguished before they can be removed. Theaforesaid jogs 0. of the bars should be made to extend from the bottomupward to the level of the tops of the transverse supporting bars D. Hawing the jogs thus constructed they are entirely out of the line of thetraverse of the poker when inserted between the bars and moved back andforth horizontally.

Having thus described my improvement in the construction of bars ofgrates of furnaces and .the manner of arranging them and the effectproduced by the use of the same, whatI claiam as newv and of my inven-.tion and desire to secure by Letters Patent 1s- The form andconstruction of the grate bars for furnaces having jogs a in the bladeof the bar A extending from the lower line or edge ofthe bar up to thelevel of the lower line c of the extension through the fire front,thereby securing the advantage of having said grate bars heldpermanently in ytheir required position by the said jogs touchingeaohot-her and at the same time leaving all that section of the openingsabove the jogs free for the admission of a. poker between the bars toremove any solid matter produced from the combustion of the fuel.

In testimony whereof I have hereunto signed my name before tWosubscribing Wit-V IIGSSGS.

FRANCIS ARMSTRONG. Witnesses:

E. JACOBS, B. Moses.`

